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关于uip中断的问题

#pragma vector=TIMER1_A0_VECTOR                         static __interrupt void ISR_Tick(void)

{

 sys_ticks++                                                      ;

 TA0CCR0  = (18000) - 1                                           ;  

}

怎么理解呢?这是uip的中断,TIMER1_A0_VECTOR 和TA0CCR0不是一个定时器啊